docs(strings): add palindrome explanation

README.md

@@ -2,6 +2,9 @@
 
 Data structure and Algorithm (DSA)
 
+## Explanations
+- [English](./docs/en)
+
 ## Contribution Guidelines
 
 ### 1. Contribution Specifications

docs/en/CONTRIBUTING.md

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+# Algorithm Name
+
+Write a short description of algorithm like:
+1. Time Complexity 
+2. Space Complexity
+3. Applications
+4. Founder's Name
+5. etc...
+
+## Steps
+
+Describe the algorithm in clear, simple and understandable steps.
+
+## Example
+
+Trace the algorithm with a sample input data.
+
+## Implementation
+
+Links to their implementation in programming languages.
+NOTE: The link should be within the other repos of this organization only.
+
+## Video URL
+
+Attach a URL of a video that explains the algorithm. 
+
+## Others
+
+Any other information is always welcome and should be included in this section.

docs/en/README.md

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+# Algorithms
+
+## Strings
+- [Palindrome](./Strings/Palindrome.md)
+
+## Others
+[How to add an new algorithm documentation ?](./CONTRIBUTING.md)

docs/en/Strings/Palindrome.md

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+# Palindrome
+A palindrome is a word, phrase, number or sequence of words that reads the same backward as forward. Punctuation and spaces between the words or lettering is allowed.
+
+## Steps
+### Step 1
+Reverse string.
+### Step 2
+Compare the reversed string to the original string, if they are equal this mean that string is palindrome.
+
+## Example
+
+### Single Word Palindromes
+- Civic
+- Level
+- Madam
+
+### Multiple Word Palindromes
+- Don't nod.
+- I did, did I?
+- My gym
+
+## Implementation
+- [C](../../../algorithms/C/strings/palindrome.c)
+- [C#](../../../algorithms/CSharp/src/Strings/palindrome.cs)
+- [Haskell](../../../algorithms/Haskell/strings/palindrome.hs)
+- [Java](../../../algorithms/Java/strings/palindrome.java)
+- [JavaScript](../../../algorithms/JavaScript/src/strings/palindrome.js)
+- [Python](../../../algorithms/Python/strings/palindrome.py)
+- [Rust](../../../algorithms/Rust/strings/palindrome/src/main.rs)
+
+## Video URL
+[A coursera video explaining the palindrome Algorithm](https://www.coursera.org/lecture/program-code/palindrome-algorithm-1-zzQqs) 
+
+## Others
+
+Any other information is always welcome and should be included in this section.